Paper cutting looks very easy, it may be difficult to do.
When she found the clothes on the playground, she at once.
The man said that he was ____ to buy this expensive house.
It is very kind ____ you to help me with these maths problems because it is very difficult ____ me to work them out.
____should be allowed to drive.
--I have failed the math test again. -- .You should work harder to pass it next time.